speedometer

I have a 2000 xterra se 4x4 3.3v6 mt. I just passed 100,000mi and I was driving down the hiway today at about 80mph and my speedometer just dropped to the stop and stayed there. Has anyone else had this problem??

I had a 1995 King Cab 4x4 v6 m/t bought it new. The speedometer started to act up at about 15K miles. The whole dash was replaced by the dealer under warranty.